I have a similar problem with my 3W-75i US TOC. This thing just runs real fat now no matter what I do. In fact it drips fuel like a drop a second while it is running. Something is defiantly wrong though, it used to run awesome and just sip fuel. I could fly for over 22 min on 24 oz of fuel with some to spare.

I have the same problem with the needles but I send the motor back and they just stretched the spring and said it ran fine. No Joy. I put it back on and had the same problems. I got so frustrated the airplane sat on the shelf all summer. Shame, waist of a good airplane, I’ve got the hankering to get it fixed now – thus I found your thread. I’m going to pull the carburetor and see what gives. Let me know what you find.
Regards,
Rick P